A couple of months back the dealer over in the next town scratched my rear rim when they did a tire change. Seems Triumph couldn't give them a color code so they took one of their wheels to a paint shop and had them do a paint match. I did the touch up myself because I didn't want them working on my bike anymore, so they gave me the small bottle of the paint. The only thing that it states on the label is the following:
Brand Code 35508
It was a good match, so any paint shop should be able to do it.